dennys From France, joined May 2001, 792 posts, RR: 1 Posted (1 year 1 week 6 days 18 hours ago) and read 1911 times:
Hi guys , can you help me .
Had the 747-341s the same engines design as the 747-441s?
They really seem to be closed one to the other .
The same case was on the Air India's 743s and 744s .
The 341 is powered by the CF6-80CB1, whilst the 441 is powered by the CF6-80C2B1F. GE aviation lists the primary difference as a higher pressure ratio and thrust for the B1F;
I suspect another difference may be in the engine control. The B1 may have a hydro-mechanical fuel control, whilst the B1F may be FADEC. The Boeing 747-337M is powered by the CF6-80C2B1, with the 437 powered by the PW-4056.
Jetlagged From United Kingdom, joined Jan 2005, 2452 posts, RR: 17 Reply 2, posted (1 year 1 week 6 days 13 hours ago) and read 1829 times:
Some late production 747-300s had GE CF6-80C2B1 engines, the same type as installed on many 747-400s. The last three Varig 747-341s had them as did two Air India 747-337s. Varig 747-441s had the same engine, but with FADEC (CF6-80C2B1F). Air India's 747-437s have a different engine, the PW4056.
edit: JetMech beat me to it! AFAIK, the only physical difference between B1 and B1F is FADEC. The B1F has a slightly higher thrust rating.
[Edited 2012-05-05 18:22:17]
The glass isn't half empty, or half full, it's twice as big as it needs to be.
Some late production 747-300s had GE CF6-80C2B1 engines, the same type as installed on many 747-400s. The last three Varig 747-341s had them as did two Air India 747-337s. Varig 747-441s had the same engine, but with FADEC (CF6-80C2B1F). Air India's 747-437s have a different engine, the PW4056.
edit: JetMech beat me to it! AFAIK, the only physical difference between B1 and B1F is FADEC. The B1F has a slightly higher thrust rating.
Are these the same engines installed on Air Force One ?
I know 'any aircraft carrying the President bla, bla, bla'
The best contribution to safety is a competent Pilot.
Starlionblue From Hong Kong, joined Feb 2004, 15868 posts, RR: 66 Reply 5, posted (1 year 1 week 6 days 4 hours ago) and read 1669 times:
Quoting Max Q (Reply 4): Quoting Jetlagged (Reply 2):
Some late production 747-300s had GE CF6-80C2B1 engines, the same type as installed on many 747-400s. The last three Varig 747-341s had them as did two Air India 747-337s. Varig 747-441s had the same engine, but with FADEC (CF6-80C2B1F). Air India's 747-437s have a different engine, the PW4056.
edit: JetMech beat me to it! AFAIK, the only physical difference between B1 and B1F is FADEC. The B1F has a slightly higher thrust rating.
Are these the same engines installed on Air Force One ?
I know 'any aircraft carrying the President bla, bla, bla'
The VC-25A (bla, bla bla) have the CF6-80C2B1F.
"There are no stupid questions, but there are a lot of inquisitive idiots." - from Citadel by John Ringo
All CF6-80C2 versions without -F are mechanical controlled with a main engine control (MEC) and a Power Management Control (PMC), a digital supervisory controller, jointly acting as the engine controlling system.
Mechanically controlled engines can have their thrust rating changed by replacing the MEC and the PMC.
The CF6-80C2B1F (as installed on the 744) introduced the first FADEC system on the CF6 family. Such electronically controlled engines have additional sensors installed on the engine, allowing a more precise control of systems, thereby decreasing fuel consumption (TSFC). On such engines the MEC and PMC are substituted by the Electronic Engine Control (EEC) . Engine thrust rating can be changed by only replacing the rating plug at the EEC.
MEC/PMC controlled CF6-80C2 engines cannot be modified to FADEC standard.
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